Just a cleanup. The immediate number makes my eye hurt.
Signed-off-by: Qu Wenruo wqu@suse.com --- fs/btrfs/compression.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 346875d45a1b..4ef44ce11485 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -12,36 +12,38 @@ #include <u-boot/zlib.h> #include <asm/unaligned.h>
+/* Header for each segment, LE32, recording the compressed size */ +#define LZO_LEN 4 static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen) { u32 tot_len, in_len, res; size_t out_len; int ret;
- if (clen < 4) + if (clen < LZO_LEN) return -1;
tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf)); - cbuf += 4; - clen -= 4; - tot_len -= 4; + cbuf += LZO_LEN; + clen -= LZO_LEN; + tot_len -= LZO_LEN;
if (tot_len == 0 && dlen) return -1; - if (tot_len < 4) + if (tot_len < LZO_LEN) return -1;
res = 0;
- while (tot_len > 4) { + while (tot_len > LZO_LEN) { in_len = le32_to_cpu(get_unaligned((u32 *)cbuf)); - cbuf += 4; - clen -= 4; + cbuf += LZO_LEN; + clen -= LZO_LEN;
- if (in_len > clen || tot_len < 4 + in_len) + if (in_len > clen || tot_len < LZO_LEN + in_len) return -1;
- tot_len -= 4 + in_len; + tot_len -= (LZO_LEN + in_len);
out_len = dlen; ret = lzo1x_decompress_safe(cbuf, in_len, dbuf, &out_len);